I have a new HP Officejetpro 8600 and refilled the second set of cartridges (I have found the starter set usually doesn't work when refilled) and the printer would not recognize that the cartridge has ink in it and would not print. I then purchased a new cartridge and it printed. Interesting that the printer will allow you to only print in black if one of the color cartridges is empty. Anyone have any insight on how to disable/override the chip and/or ink monitoring on this new MFC?